Myelin Sheath
The insulation that makes signals fast and reliable.
What is it
Myelin is a fatty substance that wraps around nerve fibers like insulation around an electrical cable. It's produced by specialised cells (oligodendrocytes in the brain, Schwann cells in the body). Without myelin, a nerve signal crawls. With thick myelin, it races.
Multiple sclerosis is what happens when myelin degrades. The signals still travel, but slowly, unreliably, sometimes not at all. The hardware is fine. The insulation is broken.
What it does in the brain
Myelin grows through repetition. Every time you practise a skill, the myelin around those nerve fibers gets a little thicker. That's why practice makes permanent: you're literally building insulation. A concert pianist has extraordinarily thick myelin around the nerve fibers that control finger movement.
The difference between an expert and a novice is not talent. It's myelin thickness.
What it does in ThetaOS
Every connection in the system has a completeness score — that's its myelin. The score depends on three things:
How many layers? A connection confirmed by a phone call (layer 1), a bank transaction (layer 3), a photo (layer 5) and a text mention (layer 6) has four layers of myelin. A connection with only a name has one.
How often per layer? Peter Ros appears in 153 photo-days. Not one photo — 153 separate days with photos. Each repetition thickens the myelin.
How complete per mention? "Peter Ros, meeting" is thin. "Peter Ros, meeting on March 17 in The Hague about DFA" is thick. Same layer, different myelin quality.
Ask Tom about someone with thick myelin and you get a rich dossier in three seconds: their role, their organisation, 153 photo-days together, 92 text mentions, 41 transactions, 10 meetings, their connection to five other clusters in your network.
Ask about someone with thin myelin and you get: "He's in the database."
That's the same difference as a myelinated nerve fiber versus a bare one. The data is there in both cases. The speed and richness of the response is entirely determined by the insulation.
Built — Layer 2 (Theta-Myelin)